A207567 Number of 6Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically

22, 484, 1690, 6709, 36426, 138017, 493471, 1980774, 7259428, 25276248, 91512891, 323438636, 1108858657, 3843873169, 13238517646, 44841691184, 152090405602, 514775385341, 1726736775278, 5782478579121, 19341544402175, 64371828667182

Offset

1,1

Comments

Row 6 of A207564

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 5*a(n-1) -6*a(n-2) +30*a(n-3) -117*a(n-4) +51*a(n-5) -132*a(n-6) +648*a(n-7) +291*a(n-8) -63*a(n-9) -1806*a(n-10) -1320*a(n-11) +45*a(n-12) +2859*a(n-13) +2046*a(n-14) +198*a(n-15) -1821*a(n-16) -1203*a(n-17) -294*a(n-18) +480*a(n-19) +153*a(n-20) -21*a(n-21) -78*a(n-22) +18*a(n-23) +19*a(n-24) +19*a(n-25)

Example

Some solutions for n=4
..1..1..0..0....1..0..1..1....0..1..1..1....1..0..0..0....0..1..1..1
..1..1..1..1....1..0..0..0....0..1..1..0....0..0..0..0....1..0..1..1
..1..1..0..0....1..1..0..0....0..1..1..1....1..1..1..1....0..1..1..1
..1..1..0..0....1..0..1..1....0..1..1..0....0..0..0..0....1..0..1..1
..1..1..0..0....1..1..0..0....0..1..1..1....1..1..1..1....0..1..1..1
..1..1..1..0....1..0..0..0....0..1..1..0....0..0..0..0....1..0..1..1

Crossrefs

Sequence in context: A208843 A207664 A208005 * A209648 A207755 A207936

Adjacent sequences: A207564 A207565 A207566 * A207568 A207569 A207570

Keyword

nonn

Author

R. H. Hardin Feb 18 2012

Status

approved